[R-390] Best way to mount rack rails

[Roger L Ruszkowski]

I have both a R-390A and SP-600 receivers which
I would like to mount into a 6 ft tall x 19" wide
standard rack cabinet. I have ball-bearing slide rails,
however the rail mounting holes (standard 19" rack
item) do not match up to the screws/holes on either
side of the radios. Matter of fact, the R-390A doesn't
even look like there are any threaded holes at all for
mounting rack rails.

How were these receives mounted into racks when used
in the military? I don't believe all the weight of
these very heavy receivers was all place entirely on
just the front panel. Was it????

Any rack rail mounting suggestions would be appreciated.
Thanks and 73s, Tom NE7X...

---------------------------------------------------------
Tom,

The R390's had angle brackets under then. about 2 1/2 x 2 1/2.
These fit the RETMA rail pattern. When bolted to the sides, the rails
held a receiver just right so the front panel bolt holes all lined up j=
ust
right.

3/4 pine 22" long and 1 1/2 wide with two holes  through the 1 1/2
dimension
will let you bolt the wood slat to the side rail with a 2 inch 10 - 32
bolt.
Use washers and do install several front panel bolts once you get the
receiver into the rack.

Angle iron from the salvage yard can be drilled and works well.
Larger wood slats (2 x 2 ) and 1U (1 3/4) blank panels work well.
There is room for the slides between the rail and the radio.
You can bolt an angle to the slide rail and set the radio on the angles=
.
this will make slide out drawers.

You can install U pans between the rails or slides. This causes a
ventilation problem. So a hole saw to open up some air flow in the
pans is in order.

An angle rail that is wide enough so that when the receiver is moved
all the way over to one side, the other side will not drop off the rail=
 is
normal. You can mark and drill the angle to fit the rack pattern.
Blots and washers will hold the rail in place with oversize (slotted)
adjustment holes.

Roger KC6TRU.

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